Hi there,
I don't know any freeware / open source tools (although they may be out there), but you could use Microsoft Visio or Macromedia Dreamweaver MX. Both products come as a Trial version, so you can check them out and see if they do the job for you.
They won't give you insight in "what calls what" but they will certainly show how pages are linked together......
Cheers,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.
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